Updated icon downloading

- Added more checks to prevent panics (Removed unwrap)
- Try do download from base domain or add www when the provided domain
  fails
- Added some more domain validation checks to prevent errors
- Added the ICON_BLACKLIST_REGEX to a Lazy Static HashMap which
  speeds-up the checks!
- Validate the Regex before starting/config change.
- Some cleanups
- Disabled some noisy debugging from 2 crates.

.env.template

@@ -104,7 +104,8 @@
 ## Icon blacklist Regex
 ## Any domains or IPs that match this regex won't be fetched by the icon service.
 ## Useful to hide other servers in the local network. Check the WIKI for more details
-# ICON_BLACKLIST_REGEX=192\.168\.1\.[0-9].*^
+## NOTE: Always enclose this regex withing single quotes!
+# ICON_BLACKLIST_REGEX='^(192\.168\.0\.[0-9]+|192\.168\.1\.[0-9]+)$'
 
 ## Any IP which is not defined as a global IP will be blacklisted.
 ## Useful to secure your internal environment: See https://en.wikipedia.org/wiki/Reserved_IP_addresses for a list of IPs which it will block

src/api/icons.rs

@@ -1,7 +1,9 @@
 use std::{
+    collections::HashMap,
     fs::{create_dir_all, remove_file, symlink_metadata, File},
     io::prelude::*,
     net::{IpAddr, ToSocketAddrs},
+    sync::RwLock,
     time::{Duration, SystemTime},
 };
 
@@ -28,20 +30,48 @@ static CLIENT: Lazy<Client> = Lazy::new(|| {
         .unwrap()
 });
 
-static ICON_REL_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"icon$|apple.*icon").unwrap());
-static ICON_HREF_REGEX: Lazy<Regex> =
-    Lazy::new(|| Regex::new(r"(?i)\w+\.(jpg|jpeg|png|ico)(\?.*)?$|^data:image.*base64").unwrap());
+// Build Regex only once since this takes a lot of time.
+static ICON_REL_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"(?i)icon$|apple.*icon").unwrap());
 static ICON_SIZE_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"(?x)(\d+)\D*(\d+)").unwrap());
 
+// Special HashMap which holds the user defined Regex to speedup matching the regex.
+static ICON_BLACKLIST_REGEX: Lazy<RwLock<HashMap<String, Regex>>> = Lazy::new(|| RwLock::new(HashMap::new()));
+
+#[get("/<domain>/icon.png")]
+fn icon(domain: String) -> Option<Cached<Content<Vec<u8>>>> {
+    if !is_valid_domain(&domain) {
+        warn!("Invalid domain: {}", domain);
+        return None;
+    }
+
+    get_icon(&domain).map(|icon| Cached::long(Content(ContentType::new("image", "x-icon"), icon)))
+}
+
+/// Returns if the domain provided is valid or not.
+///
+/// This does some manual checks and makes use of Url to do some basic checking.
+/// domains can't be larger then 63 characters (not counting multiple subdomains) according to the RFC's, but we limit the total size to 255.
 fn is_valid_domain(domain: &str) -> bool {
-    // Don't allow empty or too big domains or path traversal
-    if domain.is_empty() || domain.len() > 255 || domain.contains("..") {
+    // If parsing the domain fails using Url, it will not work with reqwest.
+    if let Err(parse_error) = Url::parse(format!("https://{}", domain).as_str()) {
+        debug!("Domain parse error: '{}' - {:?}", domain, parse_error);
+        return false;
+    } else if domain.is_empty()
+        || domain.contains("..")
+        || domain.starts_with('.')
+        || domain.starts_with('-')
+        || domain.ends_with('-')
+    {
+        debug!("Domain validation error: '{}' is either empty, contains '..', starts with an '.', starts or ends with a '-'", domain);
+        return false;
+    } else if domain.len() > 255 {
+        debug!("Domain validation error: '{}' exceeds 255 characters", domain);
         return false;
     }
 
-    // Only alphanumeric or specific characters
     for c in domain.chars() {
         if !c.is_alphanumeric() && !ALLOWED_CHARS.contains(c) {
+            debug!("Domain validation error: '{}' contains an invalid character '{}'", domain, c);
             return false;
         }
     }
@@ -49,21 +79,10 @@ fn is_valid_domain(domain: &str) -> bool {
     true
 }
 
-#[get("/<domain>/icon.png")]
-fn icon(domain: String) -> Option<Cached<Content<Vec<u8>>>> {
-    if !is_valid_domain(&domain) {
-        warn!("Invalid domain: {:#?}", domain);
-        return None;
-    }
-
-    get_icon(&domain).map(|icon| {
-        Cached::long(Content(ContentType::new("image", "x-icon"), icon))
-    })
-}
-
 /// TODO: This is extracted from IpAddr::is_global, which is unstable:
 /// https://doc.rust-lang.org/nightly/std/net/enum.IpAddr.html#method.is_global
 /// Remove once https://github.com/rust-lang/rust/issues/27709 is merged
+#[allow(clippy::nonminimal_bool)]
 #[cfg(not(feature = "unstable"))]
 fn is_global(ip: IpAddr) -> bool {
     match ip {
@@ -159,7 +178,7 @@ mod tests {
     }
 }
 
-fn check_icon_domain_is_blacklisted(domain: &str) -> bool {
+fn is_domain_blacklisted(domain: &str) -> bool {
     let mut is_blacklisted = CONFIG.icon_blacklist_non_global_ips()
         && (domain, 0)
             .to_socket_addrs()
@@ -177,7 +196,31 @@ fn check_icon_domain_is_blacklisted(domain: &str) -> bool {
     // Skip the regex check if the previous one is true already
     if !is_blacklisted {
         if let Some(blacklist) = CONFIG.icon_blacklist_regex() {
-            let regex = Regex::new(&blacklist).expect("Valid Regex");
+            let mut regex_hashmap = ICON_BLACKLIST_REGEX.read().unwrap();
+
+            // Use the pre-generate Regex stored in a Lazy HashMap if there's one, else generate it.
+            let regex = if let Some(regex) = regex_hashmap.get(&blacklist) {
+                regex
+            } else {
+                drop(regex_hashmap);
+
+                let mut regex_hashmap_write = ICON_BLACKLIST_REGEX.write().unwrap();
+                // Clear the current list if the previous key doesn't exists.
+                // To prevent growing of the HashMap after someone has changed it via the admin interface.
+                if regex_hashmap_write.len() >= 1 {
+                    regex_hashmap_write.clear();
+                }
+
+                // Generate the regex to store in too the Lazy Static HashMap.
+                let blacklist_regex = Regex::new(&blacklist).unwrap();
+                regex_hashmap_write.insert(blacklist.to_string(), blacklist_regex);
+                drop(regex_hashmap_write);
+
+                regex_hashmap = ICON_BLACKLIST_REGEX.read().unwrap();
+                regex_hashmap.get(&blacklist).unwrap()
+            };
+
+            // Use the pre-generate Regex stored in a Lazy HashMap.
             if regex.is_match(&domain) {
                 warn!("Blacklisted domain: {:#?} matched {:#?}", domain, blacklist);
                 is_blacklisted = true;
@@ -213,8 +256,7 @@ fn get_icon(domain: &str) -> Option<Vec<u8>> {
         Err(e) => {
             error!("Error downloading icon: {:?}", e);
             let miss_indicator = path + ".miss";
-            let empty_icon = Vec::new();
-            save_icon(&miss_indicator, &empty_icon);
+            save_icon(&miss_indicator, &[]);
             None
         }
     }
@@ -307,11 +349,51 @@ fn get_icon_url(domain: &str) -> Result<(Vec<Icon>, String), Error> {
     // Some sites have extra security in place with for example XSRF Tokens.
     let mut cookie_str = String::new();
 
-    let resp = get_page(&ssldomain).or_else(|_| get_page(&httpdomain));
+    // First check the domain as given during the request for both HTTPS and HTTP.
+    let resp = match get_page(&ssldomain).or_else(|_| get_page(&httpdomain)) {
+        Ok(c) => Ok(c),
+        Err(e) => {
+            let mut sub_resp = Err(e);
+
+            // When the domain is not an IP, and has more then one dot, remove all subdomains.
+            let is_ip = domain.parse::<IpAddr>();
+            if is_ip.is_err() && domain.matches('.').count() > 1 {
+                let mut domain_parts = domain.split('.');
+                let base_domain = format!(
+                    "{base}.{tld}",
+                    tld = domain_parts.next_back().unwrap(),
+                    base = domain_parts.next_back().unwrap()
+                );
+                if is_valid_domain(&base_domain) {
+                    let sslbase = format!("https://{}", base_domain);
+                    let httpbase = format!("http://{}", base_domain);
+                    debug!("[get_icon_url]: Trying without subdomains '{}'", base_domain);
+
+                    sub_resp = get_page(&sslbase).or_else(|_| get_page(&httpbase));
+                }
+
+            // When the domain is not an IP, and has less then 2 dots, try to add www. infront of it.
+            } else if is_ip.is_err() && domain.matches('.').count() < 2 {
+                let www_domain = format!("www.{}", domain);
+                if is_valid_domain(&www_domain) {
+                    let sslwww = format!("https://{}", www_domain);
+                    let httpwww = format!("http://{}", www_domain);
+                    debug!("[get_icon_url]: Trying with www. prefix '{}'", www_domain);
+
+                    sub_resp = get_page(&sslwww).or_else(|_| get_page(&httpwww));
+                }
+            }
+
+            sub_resp
+        }
+    };
+
     if let Ok(content) = resp {
         // Extract the URL from the respose in case redirects occured (like @ gitlab.com)
         let url = content.url().clone();
 
+        // Get all the cookies and pass it on to the next function.
+        // Needed for XSRF Cookies for example (like @ mijn.ing.nl)
         let raw_cookies = content.headers().get_all("set-cookie");
         cookie_str = raw_cookies
             .iter()
@@ -337,14 +419,18 @@ fn get_icon_url(domain: &str) -> Result<(Vec<Icon>, String), Error> {
         let favicons = soup
             .tag("link")
             .attr("rel", ICON_REL_REGEX.clone()) // Only use icon rels
-            .attr("href", ICON_HREF_REGEX.clone()) // Only allow specific extensions
+            .attr_name("href") // Make sure there is a href
             .find_all();
 
         // Loop through all the found icons and determine it's priority
         for favicon in favicons {
             let sizes = favicon.get("sizes");
-            let href = favicon.get("href").expect("Missing href");
-            let full_href = url.join(&href).unwrap().into_string();
+            let href = favicon.get("href").unwrap();
+            // Skip invalid url's
+            let full_href = match url.join(&href) {
+                Ok(h) => h.into_string(),
+                _ => continue,
+            };
 
             let priority = get_icon_priority(&full_href, sizes);
 
@@ -368,20 +454,18 @@ fn get_page(url: &str) -> Result<Response, Error> {
 }
 
 fn get_page_with_cookies(url: &str, cookie_str: &str) -> Result<Response, Error> {
-    if check_icon_domain_is_blacklisted(Url::parse(url).unwrap().host_str().unwrap_or_default()) {
-        err!("Favicon rel linked to a non blacklisted domain!");
+    if is_domain_blacklisted(Url::parse(url).unwrap().host_str().unwrap_or_default()) {
+        err!("Favicon rel linked to a blacklisted domain!");
     }
 
-    if cookie_str.is_empty() {
-        CLIENT.get(url).send()?.error_for_status().map_err(Into::into)
-    } else {
-        CLIENT
-            .get(url)
-            .header("cookie", cookie_str)
-            .send()?
+    let mut client = CLIENT.get(url);
+    if !cookie_str.is_empty() {
+        client = client.header("cookie", cookie_str)
+    }
+
+    client.send()?
         .error_for_status()
         .map_err(Into::into)
-    }
 }
 
 /// Returns a Integer with the priority of the type of the icon which to prefer.
@@ -464,7 +548,7 @@ fn parse_sizes(sizes: Option<String>) -> (u16, u16) {
 }
 
 fn download_icon(domain: &str) -> Result<Vec<u8>, Error> {
-    if check_icon_domain_is_blacklisted(domain) {
+    if is_domain_blacklisted(domain) {
         err!("Domain is blacklisted", domain)
     }
 
@@ -495,7 +579,7 @@ fn download_icon(domain: &str) -> Result<Vec<u8>, Error> {
                     res.copy_to(&mut buffer)?;
                     break;
                 }
-                Err(_) => info!("Download failed for {}", icon.href),
+                Err(_) => warn!("Download failed for {}", icon.href),
             };
         }
     }

src/config.rs

@@ -527,6 +527,16 @@ fn validate_config(cfg: &ConfigItems) -> Result<(), Error> {
         }
     }
 
+    // Check if the icon blacklist regex is valid
+    if let Some(ref r) = cfg.icon_blacklist_regex {
+        use regex::Regex;
+        let validate_regex = Regex::new(&r);
+        match validate_regex {
+            Ok(_) => (),
+            Err(e) => err!(format!("`ICON_BLACKLIST_REGEX` is invalid: {:#?}", e)),
+        }
+    }
+
     Ok(())
 }
 

src/main.rs

@@ -113,6 +113,9 @@ fn init_logging(level: log::LevelFilter) -> Result<(), fern::InitError> {
         .level_for("launch_", log::LevelFilter::Off)
         .level_for("rocket::rocket", log::LevelFilter::Off)
         .level_for("rocket::fairing", log::LevelFilter::Off)
+        // Never show html5ever and hyper::proto logs, too noisy
+        .level_for("html5ever", log::LevelFilter::Off)
+        .level_for("hyper::proto", log::LevelFilter::Off)
         .chain(std::io::stdout());
 
     // Enable smtp debug logging only specifically for smtp when need.